Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists in the WDR201A WiFi Extender that allows attackers to run commands on the device without needing to log in. This is because the device does not properly check information sent to it, creating an opportunity for malicious input. This issue is significant because it could allow unauthorized control of the device.
- Attackers can execute arbitrary code.
- This affects devices reachable from the internet.
- It allows remote code execution.
Attack Path
How an attacker could exploit the issue
Unauthenticated attackers can exploit this vulnerability in the WDR201A WiFi Extender by sending specially crafted POST requests to the `wireless.cgi` binary. By injecting malicious commands into the `sz11gChannel` or `PIN` parameters, they can achieve arbitrary shell command execution on the device. This allows for remote code execution without needing any prior access or credentials.
- Targets the `wireless.cgi` binary.
- Exploits unsanitized POST parameters.
- No authentication required.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows unauthenticated remote attackers to execute arbitrary shell commands on the WDR201A WiFi Extender by injecting malicious input into specific POST parameters. Such vulnerabilities are attractive to attackers because they offer a direct path to code execution without needing credentials or user interaction, enabling broad compromise of the device and potentially the network it resides on.
- No observed exploitation in the wild.
- Public exploit code is available.
- Critical unauthenticated remote code execution.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Focus on identifying and blocking any network traffic targeting the WDR201A WiFi Extender on vulnerable firmware versions. Prioritize isolating any identified affected devices to prevent further exploitation, as active exploitation is likely due to the critical severity and unauthenticated remote code execution.
- Block inbound traffic to wireless.cgi.
- Isolate affected extenders immediately.
- Monitor for new device connections.
